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- #include<stdio.h>
- #include<math.h>
- #include<string.h>
- #include<iostream>
- #include<vector>
- #include<string>
- using namespace std;
- int a[1000006];
- int main(){
- int t,n,i,j,u;
- while(n!=0){
- cin>>n;
- int dem=0;
- for(i=0;i<1000006;i++){
- a[i]=1;
- a[0]=0;
- a[1]=0;
- }
- for(i=2;i<1000006;i++){
- for(j=i*2;j<1000006;j+=i){
- a[j]=0;
- }
- }
- for(i=n+1;i<=2*n;i++){
- if(a[i]==1)
- dem++;
- }
- cout<<dem<<endl;
- }
- return 0;
- }
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